CO/Smoke detector alerts?

Anyone with good/bad experiences with the detector notifications? Most detectors now use the T3 (three beeps for smoke) or T4 (four beeps for carbon monoxide) standard UL sounds but having used three separate smoke detectors and two different CO detectors, I’ve never received any notifications.

And that makes me sad because it was one of the original features that got me to purchase my first v2 camera years ago.

I’ve even set up automations using ITTT (all lights on, record clips, notify, turn off the HVAC) but nothing ever seems to trip the sensor.